It's the same as Denagard, it's 12.5% tiamulin. It's labeled for use in poultry in the UK - Use 2ml per liter for treatment:
https://hyperdrug.co.uk/denagard-solution-12-5-1l/
https://hyperdrug.co.uk/content/data-sheets/Data-Sheet-TIAMUTINSOL-8394.pdf